diff --git a/core/core.services.yml b/core/core.services.yml
index 12498b7a962..250be9eab34 100644
--- a/core/core.services.yml
+++ b/core/core.services.yml
@@ -217,8 +217,6 @@ services:
   container.namespaces:
     class: ArrayObject
     arguments: [ '%container.namespaces%' ]
-    tags:
-      - { name: persist }
   container.trait:
     abstract: true
     calls:
diff --git a/core/lib/Drupal/Core/DrupalKernel.php b/core/lib/Drupal/Core/DrupalKernel.php
index d3b7b1bbe1f..4349d2755cf 100644
--- a/core/lib/Drupal/Core/DrupalKernel.php
+++ b/core/lib/Drupal/Core/DrupalKernel.php
@@ -426,13 +426,6 @@ class DrupalKernel implements DrupalKernelInterface, TerminableInterface {
       $this->container = $this->buildContainer();
       $this->persistServices($persist);
 
-      // The namespaces are marked as persistent, so objects like the annotated
-      // class discovery still has the right object. We may have updated the
-      // list of modules, so set it.
-      if ($this->container->initialized('container.namespaces')) {
-        $this->container->get('container.namespaces')->exchangeArray($this->container->getParameter('container.namespaces'));
-      }
-
       if ($this->allowDumping) {
         $this->containerNeedsDumping = TRUE;
       }